Fluval Breeding Box
Easily attaching to the side of most aquariums up to 1″ thick, the Hang-On Breeder Box provides isolated housing for protecting fry, sick/weak fish or new fish that require acclimation.
- Multi-functional breeder box
- Ideal as a hatchery and incubator to help protect new born fry from being eaten (improves survival rate)
- Provides a safe haven for injured or weak fish
- Helps acclimate new fish as water circulates throughout box from aquarium
- Hangs onto aquarium exterior for easily observing fish and convenient maintenance
- Space-saving design – measures 6.5″ L x 5″ W x 4.75″ H / 16.5 x 12.5 x 12 cm and holds 0.3 US Gal / 1.1 L of water
- For use with frameless aquariums with a glass thickness of 0.75″
| Dimensions | 6.5″ L x 5″ W x 4.75″ H |
|---|---|
| Capacity | 0.3 US Gal (1.1 L) |
| Compatible Aquarium Glass Thickness | Up to 1″ |
FAQ
Can the breeding box be used for acclimating new fish?
Yes, the breeding box helps acclimate new fish as water circulates from the main aquarium, allowing gradual adjustment to new water conditions.
Is the box suitable for fry protection?
Yes, it serves as an effective hatchery and incubator to protect newborn fry from being eaten by adult fish, improving fry survival rates.
Can it be attached to a frameless aquarium?
Yes, it is designed for use with frameless aquariums that have a glass thickness of up to 1 inch.

Kevin Pullman –
This breeding box has been a game changer for my fry. I’ve seen a noticeable increase in fry survival since using it. The setup is simple and the box stays securely in place. Great for protecting new fish during acclimation.
Edward Blake –
I used it to house weak fish during recovery. The water circulation helps keep them stable. It’s easy to monitor and clean. A small but useful addition to any aquarium.
Faith Randall –
The box fits perfectly on my 10-gallon tank. I used it to incubate fry and the fry stayed safe from adult fish. The design is compact and doesn’t take up much space.